Merge values from different arrays to one with the same key

Question

I have two arrays:

Array
(
    [0] => 5
    [1] => 4
)
Array
(
    [0] => BMW
    [1] => Ferrari
)

And I would like to have tha

Answer 1

You can use array_map with null as the first argument (there is an example in the manual), to get your desired result:

 5, 1 => 4];
$cars = [0 => 'BMW', 1 => 'Ferrari'];

var_export(array_map(null, $nums, $cars));

Output:

array (
0 => 
array (
    0 => 5,
    1 => 'BMW',
),
1 => 
array (
    0 => 4,
    1 => 'Ferrari',
),
)

Note that the following input would give the same result:

$nums = ['puff' => 5, 'powder' => 4];
$cars = ['powder' => 'BMW', 'puff' => 'Ferrari'];

It is the order, not the keys, that determine the pairings in the result when using array_map as above.

To associate by key using foreach (note order of $cars):

 5, 1 => 4];
$cars = [1 => 'Ferrari', 0 => 'BMW'];
foreach($nums as $k => $num)
    $result[] = [$num, $cars[$k]];

var_export($result);

Results also in the desired output.